And he built the walls of the house inside with boards of cedar, both the floor of the house, and the walls of the ceiling: and he covered them on the inside with wood, and covered the floor of the house with planks of fir.
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Bede
AD 735
On the inside, indeed, the house was lined with cedar, for on the outside, the actual stone it was built of glinted with as much brilliance as if it had been covered with glowing white marble. Taken in the mystical sense, however, the temple walls are the nations of believers of whom the holy universal church consists and whose widespread distribution throughout the whole world is denoted by the width of the walls, whereas the height denotes the hope and whole upward thrust of the church toward heavenly things, or at any rate the height of the wall, which consists of courses of stones laid one on top of the other, denotes the state of the present church where the elect are all built on the foundation of Christ and follow each other in succession through the course of the ages and, by supporting each other, fulfill the law of Christ, which is charity. - "On the Temple 1.8.6"
Fir. Or perhaps of another species of cedar, resembling the juniper-tree. It is found in Phoenecian and in Lycia. See chap. v. 8. It is doubted whether the sanctuary was also boarded, as we read that it was paved with marble. Hebrew, "with precious or costly stones "2 Paralipomenon iii. 6. But boards might be laid upon them, as they were on other parts of the temple. The magnificence of Solomon appears in his using such costly things, even where they would not be exposed to view. The floor was again covered with plates of gold, ver. 30.